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Steel Making

Annealing
ANNEALING can be done by heating to temperatures ranging from...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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